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Finding the Fourth Proportional to 20,618.40, 30,935.70 and 8,136.30

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Solution

The fourth proportional to 20,618.40, 30,935.70 and 8,136.30 is: 12,207.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618.40 : 30,935.70 = 8,136.30 : x
  2. Step 2: Convert to fraction form
    20,618.40/30,935.70 = 8,136.30/x
  3. Step 3: Cross multiply
    20,618.40x = 30,935.70 × 8,136.30
  4. Step 4: Simplify right side
    20,618.40x = 251,702,135.91
  5. Step 5: Solve for x
    x = 251,702,135.91/20,618.40
  6. Step 6: Final answer
    x = 12,207.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.